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Regeneration of spent zinc halide catalyst using preliminary high pressure hydrogen solvent extraction

US 3,629,159 A · Inventors: GORIN EVERETT et al.

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  • Granted December 21, 1971. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by December 21, 1988.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledDecember 3, 1969
GrantedDecember 21, 1971
Term endedDecember 21, 1988
Application number—
Classification (CPC)C10G47/08 +1 more
Length2 pages

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Full published documentText and every drawing sheet as a PDF.USPTOFile historyStatus, office actions, notices, fee records and petitions.USPTO Patent CenterPatent Public Search recordSearchable full text and bibliographic data.USPTO

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